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ARM: 8217/1: sa1100 collie: use gpio-charger instead of pda-power
[linux/fpc-iii.git] / fs / nfs / inode.c
blob6388a59f2add0683d759606c1925c35546e914c1
1 /*
2 * linux/fs/nfs/inode.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs inode and superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 */
15
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/sched.h>
19 #include <linux/time.h>
20 #include <linux/kernel.h>
21 #include <linux/mm.h>
22 #include <linux/string.h>
23 #include <linux/stat.h>
24 #include <linux/errno.h>
25 #include <linux/unistd.h>
26 #include <linux/sunrpc/clnt.h>
27 #include <linux/sunrpc/stats.h>
28 #include <linux/sunrpc/metrics.h>
29 #include <linux/nfs_fs.h>
30 #include <linux/nfs_mount.h>
31 #include <linux/nfs4_mount.h>
32 #include <linux/lockd/bind.h>
33 #include <linux/seq_file.h>
34 #include <linux/mount.h>
35 #include <linux/vfs.h>
36 #include <linux/inet.h>
37 #include <linux/nfs_xdr.h>
38 #include <linux/slab.h>
39 #include <linux/compat.h>
40 #include <linux/freezer.h>
41
42 #include <asm/uaccess.h>
43
44 #include "nfs4_fs.h"
45 #include "callback.h"
46 #include "delegation.h"
47 #include "iostat.h"
48 #include "internal.h"
49 #include "fscache.h"
50 #include "pnfs.h"
51 #include "nfs.h"
52 #include "netns.h"
53
54 #include "nfstrace.h"
55
56 #define NFSDBG_FACILITY NFSDBG_VFS
57
58 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
59
60 /* Default is to see 64-bit inode numbers */
61 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
62
63 static void nfs_invalidate_inode(struct inode *);
64 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
65
66 static struct kmem_cache * nfs_inode_cachep;
67
68 static inline unsigned long
69 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
70 {
71 return nfs_fileid_to_ino_t(fattr->fileid);
72 }
73
74 /**
75 * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
76 * @word: long word containing the bit lock
77 */
78 int nfs_wait_bit_killable(struct wait_bit_key *key)
79 {
80 if (fatal_signal_pending(current))
81 return -ERESTARTSYS;
82 freezable_schedule_unsafe();
83 return 0;
84 }
85 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
86
87 /**
88 * nfs_compat_user_ino64 - returns the user-visible inode number
89 * @fileid: 64-bit fileid
90 *
91 * This function returns a 32-bit inode number if the boot parameter
92 * nfs.enable_ino64 is zero.
93 */
94 u64 nfs_compat_user_ino64(u64 fileid)
95 {
96 #ifdef CONFIG_COMPAT
97 compat_ulong_t ino;
98 #else
99 unsigned long ino;
100 #endif
101
102 if (enable_ino64)
103 return fileid;
104 ino = fileid;
105 if (sizeof(ino) < sizeof(fileid))
106 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
107 return ino;
108 }
109
110 int nfs_drop_inode(struct inode *inode)
111 {
112 return NFS_STALE(inode) || generic_drop_inode(inode);
113 }
114 EXPORT_SYMBOL_GPL(nfs_drop_inode);
115
116 void nfs_clear_inode(struct inode *inode)
117 {
118 /*
119 * The following should never happen...
120 */
121 WARN_ON_ONCE(nfs_have_writebacks(inode));
122 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
123 nfs_zap_acl_cache(inode);
124 nfs_access_zap_cache(inode);
125 nfs_fscache_clear_inode(inode);
126 }
127 EXPORT_SYMBOL_GPL(nfs_clear_inode);
128
129 void nfs_evict_inode(struct inode *inode)
130 {
131 truncate_inode_pages_final(&inode->i_data);
132 clear_inode(inode);
133 nfs_clear_inode(inode);
134 }
135
136 /**
137 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
138 */
139 int nfs_sync_mapping(struct address_space *mapping)
140 {
141 int ret = 0;
142
143 if (mapping->nrpages != 0) {
144 unmap_mapping_range(mapping, 0, 0, 0);
145 ret = nfs_wb_all(mapping->host);
146 }
147 return ret;
148 }
149
150 static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
151 {
152 struct nfs_inode *nfsi = NFS_I(inode);
153
154 if (inode->i_mapping->nrpages == 0)
155 flags &= ~NFS_INO_INVALID_DATA;
156 nfsi->cache_validity |= flags;
157 if (flags & NFS_INO_INVALID_DATA)
158 nfs_fscache_invalidate(inode);
159 }
160
161 /*
162 * Invalidate the local caches
163 */
164 static void nfs_zap_caches_locked(struct inode *inode)
165 {
166 struct nfs_inode *nfsi = NFS_I(inode);
167 int mode = inode->i_mode;
168
169 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
170
171 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
172 nfsi->attrtimeo_timestamp = jiffies;
173
174 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
175 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
176 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
177 | NFS_INO_INVALID_DATA
178 | NFS_INO_INVALID_ACCESS
179 | NFS_INO_INVALID_ACL
180 | NFS_INO_REVAL_PAGECACHE);
181 } else
182 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
183 | NFS_INO_INVALID_ACCESS
184 | NFS_INO_INVALID_ACL
185 | NFS_INO_REVAL_PAGECACHE);
186 nfs_zap_label_cache_locked(nfsi);
187 }
188
189 void nfs_zap_caches(struct inode *inode)
190 {
191 spin_lock(&inode->i_lock);
192 nfs_zap_caches_locked(inode);
193 spin_unlock(&inode->i_lock);
194 }
195
196 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
197 {
198 if (mapping->nrpages != 0) {
199 spin_lock(&inode->i_lock);
200 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
201 spin_unlock(&inode->i_lock);
202 }
203 }
204
205 void nfs_zap_acl_cache(struct inode *inode)
206 {
207 void (*clear_acl_cache)(struct inode *);
208
209 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
210 if (clear_acl_cache != NULL)
211 clear_acl_cache(inode);
212 spin_lock(&inode->i_lock);
213 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
214 spin_unlock(&inode->i_lock);
215 }
216 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
217
218 void nfs_invalidate_atime(struct inode *inode)
219 {
220 spin_lock(&inode->i_lock);
221 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
222 spin_unlock(&inode->i_lock);
223 }
224 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
225
226 /*
227 * Invalidate, but do not unhash, the inode.
228 * NB: must be called with inode->i_lock held!
229 */
230 static void nfs_invalidate_inode(struct inode *inode)
231 {
232 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
233 nfs_zap_caches_locked(inode);
234 }
235
236 struct nfs_find_desc {
237 struct nfs_fh *fh;
238 struct nfs_fattr *fattr;
239 };
240
241 /*
242 * In NFSv3 we can have 64bit inode numbers. In order to support
243 * this, and re-exported directories (also seen in NFSv2)
244 * we are forced to allow 2 different inodes to have the same
245 * i_ino.
246 */
247 static int
248 nfs_find_actor(struct inode *inode, void *opaque)
249 {
250 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
251 struct nfs_fh *fh = desc->fh;
252 struct nfs_fattr *fattr = desc->fattr;
253
254 if (NFS_FILEID(inode) != fattr->fileid)
255 return 0;
256 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
257 return 0;
258 if (nfs_compare_fh(NFS_FH(inode), fh))
259 return 0;
260 if (is_bad_inode(inode) || NFS_STALE(inode))
261 return 0;
262 return 1;
263 }
264
265 static int
266 nfs_init_locked(struct inode *inode, void *opaque)
267 {
268 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
269 struct nfs_fattr *fattr = desc->fattr;
270
271 set_nfs_fileid(inode, fattr->fileid);
272 nfs_copy_fh(NFS_FH(inode), desc->fh);
273 return 0;
274 }
275
276 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
277 static void nfs_clear_label_invalid(struct inode *inode)
278 {
279 spin_lock(&inode->i_lock);
280 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
281 spin_unlock(&inode->i_lock);
282 }
283
284 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
285 struct nfs4_label *label)
286 {
287 int error;
288
289 if (label == NULL)
290 return;
291
292 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
293 error = security_inode_notifysecctx(inode, label->label,
294 label->len);
295 if (error)
296 printk(KERN_ERR "%s() %s %d "
297 "security_inode_notifysecctx() %d\n",
298 __func__,
299 (char *)label->label,
300 label->len, error);
301 nfs_clear_label_invalid(inode);
302 }
303 }
304
305 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
306 {
307 struct nfs4_label *label = NULL;
308 int minor_version = server->nfs_client->cl_minorversion;
309
310 if (minor_version < 2)
311 return label;
312
313 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
314 return label;
315
316 label = kzalloc(sizeof(struct nfs4_label), flags);
317 if (label == NULL)
318 return ERR_PTR(-ENOMEM);
319
320 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
321 if (label->label == NULL) {
322 kfree(label);
323 return ERR_PTR(-ENOMEM);
324 }
325 label->len = NFS4_MAXLABELLEN;
326
327 return label;
328 }
329 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
330 #else
331 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
332 struct nfs4_label *label)
333 {
334 }
335 #endif
336 EXPORT_SYMBOL_GPL(nfs_setsecurity);
337
338 /*
339 * This is our front-end to iget that looks up inodes by file handle
340 * instead of inode number.
341 */
342 struct inode *
343 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
344 {
345 struct nfs_find_desc desc = {
346 .fh = fh,
347 .fattr = fattr
348 };
349 struct inode *inode = ERR_PTR(-ENOENT);
350 unsigned long hash;
351
352 nfs_attr_check_mountpoint(sb, fattr);
353
354 if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
355 !nfs_attr_use_mounted_on_fileid(fattr))
356 goto out_no_inode;
357 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
358 goto out_no_inode;
359
360 hash = nfs_fattr_to_ino_t(fattr);
361
362 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
363 if (inode == NULL) {
364 inode = ERR_PTR(-ENOMEM);
365 goto out_no_inode;
366 }
367
368 if (inode->i_state & I_NEW) {
369 struct nfs_inode *nfsi = NFS_I(inode);
370 unsigned long now = jiffies;
371
372 /* We set i_ino for the few things that still rely on it,
373 * such as stat(2) */
374 inode->i_ino = hash;
375
376 /* We can't support update_atime(), since the server will reset it */
377 inode->i_flags |= S_NOATIME|S_NOCMTIME;
378 inode->i_mode = fattr->mode;
379 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
380 && nfs_server_capable(inode, NFS_CAP_MODE))
381 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
382 /* Why so? Because we want revalidate for devices/FIFOs, and
383 * that's precisely what we have in nfs_file_inode_operations.
384 */
385 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
386 if (S_ISREG(inode->i_mode)) {
387 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
388 inode->i_data.a_ops = &nfs_file_aops;
389 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
390 } else if (S_ISDIR(inode->i_mode)) {
391 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
392 inode->i_fop = &nfs_dir_operations;
393 inode->i_data.a_ops = &nfs_dir_aops;
394 /* Deal with crossing mountpoints */
395 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
396 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
397 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
398 inode->i_op = &nfs_referral_inode_operations;
399 else
400 inode->i_op = &nfs_mountpoint_inode_operations;
401 inode->i_fop = NULL;
402 inode->i_flags |= S_AUTOMOUNT;
403 }
404 } else if (S_ISLNK(inode->i_mode))
405 inode->i_op = &nfs_symlink_inode_operations;
406 else
407 init_special_inode(inode, inode->i_mode, fattr->rdev);
408
409 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
410 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
411 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
412 inode->i_version = 0;
413 inode->i_size = 0;
414 clear_nlink(inode);
415 inode->i_uid = make_kuid(&init_user_ns, -2);
416 inode->i_gid = make_kgid(&init_user_ns, -2);
417 inode->i_blocks = 0;
418 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
419 nfsi->write_io = 0;
420 nfsi->read_io = 0;
421
422 nfsi->read_cache_jiffies = fattr->time_start;
423 nfsi->attr_gencount = fattr->gencount;
424 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
425 inode->i_atime = fattr->atime;
426 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
427 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
428 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
429 inode->i_mtime = fattr->mtime;
430 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
431 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
432 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
433 inode->i_ctime = fattr->ctime;
434 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
435 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
436 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
437 inode->i_version = fattr->change_attr;
438 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
439 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
440 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
441 inode->i_size = nfs_size_to_loff_t(fattr->size);
442 else
443 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
444 | NFS_INO_REVAL_PAGECACHE);
445 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
446 set_nlink(inode, fattr->nlink);
447 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
448 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
449 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
450 inode->i_uid = fattr->uid;
451 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
452 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
453 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
454 inode->i_gid = fattr->gid;
455 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
456 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
457 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
458 inode->i_blocks = fattr->du.nfs2.blocks;
459 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
460 /*
461 * report the blocks in 512byte units
462 */
463 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
464 }
465
466 nfs_setsecurity(inode, fattr, label);
467
468 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
469 nfsi->attrtimeo_timestamp = now;
470 nfsi->access_cache = RB_ROOT;
471
472 nfs_fscache_init_inode(inode);
473
474 unlock_new_inode(inode);
475 } else
476 nfs_refresh_inode(inode, fattr);
477 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
478 inode->i_sb->s_id,
479 (unsigned long long)NFS_FILEID(inode),
480 nfs_display_fhandle_hash(fh),
481 atomic_read(&inode->i_count));
482
483 out:
484 return inode;
485
486 out_no_inode:
487 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
488 goto out;
489 }
490 EXPORT_SYMBOL_GPL(nfs_fhget);
491
492 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN)
493
494 int
495 nfs_setattr(struct dentry *dentry, struct iattr *attr)
496 {
497 struct inode *inode = dentry->d_inode;
498 struct nfs_fattr *fattr;
499 int error = -ENOMEM;
500
501 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
502
503 /* skip mode change if it's just for clearing setuid/setgid */
504 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
505 attr->ia_valid &= ~ATTR_MODE;
506
507 if (attr->ia_valid & ATTR_SIZE) {
508 BUG_ON(!S_ISREG(inode->i_mode));
509
510 if (attr->ia_size == i_size_read(inode))
511 attr->ia_valid &= ~ATTR_SIZE;
512 }
513
514 /* Optimization: if the end result is no change, don't RPC */
515 attr->ia_valid &= NFS_VALID_ATTRS;
516 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
517 return 0;
518
519 trace_nfs_setattr_enter(inode);
520
521 /* Write all dirty data */
522 if (S_ISREG(inode->i_mode)) {
523 nfs_inode_dio_wait(inode);
524 nfs_wb_all(inode);
525 }
526
527 fattr = nfs_alloc_fattr();
528 if (fattr == NULL)
529 goto out;
530 /*
531 * Return any delegations if we're going to change ACLs
532 */
533 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
534 NFS_PROTO(inode)->return_delegation(inode);
535 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
536 if (error == 0)
537 error = nfs_refresh_inode(inode, fattr);
538 nfs_free_fattr(fattr);
539 out:
540 trace_nfs_setattr_exit(inode, error);
541 return error;
542 }
543 EXPORT_SYMBOL_GPL(nfs_setattr);
544
545 /**
546 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
547 * @inode: inode of the file used
548 * @offset: file offset to start truncating
549 *
550 * This is a copy of the common vmtruncate, but with the locking
551 * corrected to take into account the fact that NFS requires
552 * inode->i_size to be updated under the inode->i_lock.
553 */
554 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
555 {
556 int err;
557
558 err = inode_newsize_ok(inode, offset);
559 if (err)
560 goto out;
561
562 spin_lock(&inode->i_lock);
563 i_size_write(inode, offset);
564 /* Optimisation */
565 if (offset == 0)
566 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
567 spin_unlock(&inode->i_lock);
568
569 truncate_pagecache(inode, offset);
570 out:
571 return err;
572 }
573
574 /**
575 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
576 * @inode: pointer to struct inode
577 * @attr: pointer to struct iattr
578 *
579 * Note: we do this in the *proc.c in order to ensure that
580 * it works for things like exclusive creates too.
581 */
582 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
583 {
584 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
585 spin_lock(&inode->i_lock);
586 if ((attr->ia_valid & ATTR_MODE) != 0) {
587 int mode = attr->ia_mode & S_IALLUGO;
588 mode |= inode->i_mode & ~S_IALLUGO;
589 inode->i_mode = mode;
590 }
591 if ((attr->ia_valid & ATTR_UID) != 0)
592 inode->i_uid = attr->ia_uid;
593 if ((attr->ia_valid & ATTR_GID) != 0)
594 inode->i_gid = attr->ia_gid;
595 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
596 | NFS_INO_INVALID_ACL);
597 spin_unlock(&inode->i_lock);
598 }
599 if ((attr->ia_valid & ATTR_SIZE) != 0) {
600 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
601 nfs_vmtruncate(inode, attr->ia_size);
602 }
603 }
604 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
605
606 static void nfs_request_parent_use_readdirplus(struct dentry *dentry)
607 {
608 struct dentry *parent;
609
610 parent = dget_parent(dentry);
611 nfs_force_use_readdirplus(parent->d_inode);
612 dput(parent);
613 }
614
615 static bool nfs_need_revalidate_inode(struct inode *inode)
616 {
617 if (NFS_I(inode)->cache_validity &
618 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
619 return true;
620 if (nfs_attribute_cache_expired(inode))
621 return true;
622 return false;
623 }
624
625 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
626 {
627 struct inode *inode = dentry->d_inode;
628 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
629 int err;
630
631 trace_nfs_getattr_enter(inode);
632 /* Flush out writes to the server in order to update c/mtime. */
633 if (S_ISREG(inode->i_mode)) {
634 nfs_inode_dio_wait(inode);
635 err = filemap_write_and_wait(inode->i_mapping);
636 if (err)
637 goto out;
638 }
639
640 /*
641 * We may force a getattr if the user cares about atime.
642 *
643 * Note that we only have to check the vfsmount flags here:
644 * - NFS always sets S_NOATIME by so checking it would give a
645 * bogus result
646 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
647 * no point in checking those.
648 */
649 if ((mnt->mnt_flags & MNT_NOATIME) ||
650 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
651 need_atime = 0;
652
653 if (need_atime || nfs_need_revalidate_inode(inode)) {
654 struct nfs_server *server = NFS_SERVER(inode);
655
656 if (server->caps & NFS_CAP_READDIRPLUS)
657 nfs_request_parent_use_readdirplus(dentry);
658 err = __nfs_revalidate_inode(server, inode);
659 }
660 if (!err) {
661 generic_fillattr(inode, stat);
662 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
663 }
664 out:
665 trace_nfs_getattr_exit(inode, err);
666 return err;
667 }
668 EXPORT_SYMBOL_GPL(nfs_getattr);
669
670 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
671 {
672 atomic_set(&l_ctx->count, 1);
673 l_ctx->lockowner.l_owner = current->files;
674 l_ctx->lockowner.l_pid = current->tgid;
675 INIT_LIST_HEAD(&l_ctx->list);
676 nfs_iocounter_init(&l_ctx->io_count);
677 }
678
679 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
680 {
681 struct nfs_lock_context *head = &ctx->lock_context;
682 struct nfs_lock_context *pos = head;
683
684 do {
685 if (pos->lockowner.l_owner != current->files)
686 continue;
687 if (pos->lockowner.l_pid != current->tgid)
688 continue;
689 atomic_inc(&pos->count);
690 return pos;
691 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
692 return NULL;
693 }
694
695 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
696 {
697 struct nfs_lock_context *res, *new = NULL;
698 struct inode *inode = ctx->dentry->d_inode;
699
700 spin_lock(&inode->i_lock);
701 res = __nfs_find_lock_context(ctx);
702 if (res == NULL) {
703 spin_unlock(&inode->i_lock);
704 new = kmalloc(sizeof(*new), GFP_KERNEL);
705 if (new == NULL)
706 return ERR_PTR(-ENOMEM);
707 nfs_init_lock_context(new);
708 spin_lock(&inode->i_lock);
709 res = __nfs_find_lock_context(ctx);
710 if (res == NULL) {
711 list_add_tail(&new->list, &ctx->lock_context.list);
712 new->open_context = ctx;
713 res = new;
714 new = NULL;
715 }
716 }
717 spin_unlock(&inode->i_lock);
718 kfree(new);
719 return res;
720 }
721 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
722
723 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
724 {
725 struct nfs_open_context *ctx = l_ctx->open_context;
726 struct inode *inode = ctx->dentry->d_inode;
727
728 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
729 return;
730 list_del(&l_ctx->list);
731 spin_unlock(&inode->i_lock);
732 kfree(l_ctx);
733 }
734 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
735
736 /**
737 * nfs_close_context - Common close_context() routine NFSv2/v3
738 * @ctx: pointer to context
739 * @is_sync: is this a synchronous close
740 *
741 * always ensure that the attributes are up to date if we're mounted
742 * with close-to-open semantics
743 */
744 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
745 {
746 struct inode *inode;
747 struct nfs_server *server;
748
749 if (!(ctx->mode & FMODE_WRITE))
750 return;
751 if (!is_sync)
752 return;
753 inode = ctx->dentry->d_inode;
754 if (!list_empty(&NFS_I(inode)->open_files))
755 return;
756 server = NFS_SERVER(inode);
757 if (server->flags & NFS_MOUNT_NOCTO)
758 return;
759 nfs_revalidate_inode(server, inode);
760 }
761 EXPORT_SYMBOL_GPL(nfs_close_context);
762
763 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
764 {
765 struct nfs_open_context *ctx;
766 struct rpc_cred *cred = rpc_lookup_cred();
767 if (IS_ERR(cred))
768 return ERR_CAST(cred);
769
770 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
771 if (!ctx) {
772 put_rpccred(cred);
773 return ERR_PTR(-ENOMEM);
774 }
775 nfs_sb_active(dentry->d_sb);
776 ctx->dentry = dget(dentry);
777 ctx->cred = cred;
778 ctx->state = NULL;
779 ctx->mode = f_mode;
780 ctx->flags = 0;
781 ctx->error = 0;
782 nfs_init_lock_context(&ctx->lock_context);
783 ctx->lock_context.open_context = ctx;
784 INIT_LIST_HEAD(&ctx->list);
785 ctx->mdsthreshold = NULL;
786 return ctx;
787 }
788 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
789
790 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
791 {
792 if (ctx != NULL)
793 atomic_inc(&ctx->lock_context.count);
794 return ctx;
795 }
796 EXPORT_SYMBOL_GPL(get_nfs_open_context);
797
798 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
799 {
800 struct inode *inode = ctx->dentry->d_inode;
801 struct super_block *sb = ctx->dentry->d_sb;
802
803 if (!list_empty(&ctx->list)) {
804 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
805 return;
806 list_del(&ctx->list);
807 spin_unlock(&inode->i_lock);
808 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
809 return;
810 if (inode != NULL)
811 NFS_PROTO(inode)->close_context(ctx, is_sync);
812 if (ctx->cred != NULL)
813 put_rpccred(ctx->cred);
814 dput(ctx->dentry);
815 nfs_sb_deactive(sb);
816 kfree(ctx->mdsthreshold);
817 kfree(ctx);
818 }
819
820 void put_nfs_open_context(struct nfs_open_context *ctx)
821 {
822 __put_nfs_open_context(ctx, 0);
823 }
824 EXPORT_SYMBOL_GPL(put_nfs_open_context);
825
826 /*
827 * Ensure that mmap has a recent RPC credential for use when writing out
828 * shared pages
829 */
830 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
831 {
832 struct inode *inode = ctx->dentry->d_inode;
833 struct nfs_inode *nfsi = NFS_I(inode);
834
835 spin_lock(&inode->i_lock);
836 list_add(&ctx->list, &nfsi->open_files);
837 spin_unlock(&inode->i_lock);
838 }
839 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
840
841 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
842 {
843 filp->private_data = get_nfs_open_context(ctx);
844 if (list_empty(&ctx->list))
845 nfs_inode_attach_open_context(ctx);
846 }
847 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
848
849 /*
850 * Given an inode, search for an open context with the desired characteristics
851 */
852 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
853 {
854 struct nfs_inode *nfsi = NFS_I(inode);
855 struct nfs_open_context *pos, *ctx = NULL;
856
857 spin_lock(&inode->i_lock);
858 list_for_each_entry(pos, &nfsi->open_files, list) {
859 if (cred != NULL && pos->cred != cred)
860 continue;
861 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
862 continue;
863 ctx = get_nfs_open_context(pos);
864 break;
865 }
866 spin_unlock(&inode->i_lock);
867 return ctx;
868 }
869
870 static void nfs_file_clear_open_context(struct file *filp)
871 {
872 struct nfs_open_context *ctx = nfs_file_open_context(filp);
873
874 if (ctx) {
875 struct inode *inode = ctx->dentry->d_inode;
876
877 filp->private_data = NULL;
878 spin_lock(&inode->i_lock);
879 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
880 spin_unlock(&inode->i_lock);
881 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
882 }
883 }
884
885 /*
886 * These allocate and release file read/write context information.
887 */
888 int nfs_open(struct inode *inode, struct file *filp)
889 {
890 struct nfs_open_context *ctx;
891
892 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
893 if (IS_ERR(ctx))
894 return PTR_ERR(ctx);
895 nfs_file_set_open_context(filp, ctx);
896 put_nfs_open_context(ctx);
897 nfs_fscache_open_file(inode, filp);
898 return 0;
899 }
900
901 int nfs_release(struct inode *inode, struct file *filp)
902 {
903 nfs_file_clear_open_context(filp);
904 return 0;
905 }
906
907 /*
908 * This function is called whenever some part of NFS notices that
909 * the cached attributes have to be refreshed.
910 */
911 int
912 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
913 {
914 int status = -ESTALE;
915 struct nfs4_label *label = NULL;
916 struct nfs_fattr *fattr = NULL;
917 struct nfs_inode *nfsi = NFS_I(inode);
918
919 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
920 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
921
922 trace_nfs_revalidate_inode_enter(inode);
923
924 if (is_bad_inode(inode))
925 goto out;
926 if (NFS_STALE(inode))
927 goto out;
928
929 status = -ENOMEM;
930 fattr = nfs_alloc_fattr();
931 if (fattr == NULL)
932 goto out;
933
934 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
935
936 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
937 if (IS_ERR(label)) {
938 status = PTR_ERR(label);
939 goto out;
940 }
941
942 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
943 if (status != 0) {
944 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
945 inode->i_sb->s_id,
946 (unsigned long long)NFS_FILEID(inode), status);
947 if (status == -ESTALE) {
948 nfs_zap_caches(inode);
949 if (!S_ISDIR(inode->i_mode))
950 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
951 }
952 goto err_out;
953 }
954
955 status = nfs_refresh_inode(inode, fattr);
956 if (status) {
957 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
958 inode->i_sb->s_id,
959 (unsigned long long)NFS_FILEID(inode), status);
960 goto err_out;
961 }
962
963 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
964 nfs_zap_acl_cache(inode);
965
966 nfs_setsecurity(inode, fattr, label);
967
968 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
969 inode->i_sb->s_id,
970 (unsigned long long)NFS_FILEID(inode));
971
972 err_out:
973 nfs4_label_free(label);
974 out:
975 nfs_free_fattr(fattr);
976 trace_nfs_revalidate_inode_exit(inode, status);
977 return status;
978 }
979
980 int nfs_attribute_timeout(struct inode *inode)
981 {
982 struct nfs_inode *nfsi = NFS_I(inode);
983
984 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
985 }
986
987 int nfs_attribute_cache_expired(struct inode *inode)
988 {
989 if (nfs_have_delegated_attributes(inode))
990 return 0;
991 return nfs_attribute_timeout(inode);
992 }
993
994 /**
995 * nfs_revalidate_inode - Revalidate the inode attributes
996 * @server - pointer to nfs_server struct
997 * @inode - pointer to inode struct
998 *
999 * Updates inode attribute information by retrieving the data from the server.
1000 */
1001 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1002 {
1003 if (!nfs_need_revalidate_inode(inode))
1004 return NFS_STALE(inode) ? -ESTALE : 0;
1005 return __nfs_revalidate_inode(server, inode);
1006 }
1007 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1008
1009 int nfs_revalidate_inode_rcu(struct nfs_server *server, struct inode *inode)
1010 {
1011 if (!(NFS_I(inode)->cache_validity &
1012 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
1013 && !nfs_attribute_cache_expired(inode))
1014 return NFS_STALE(inode) ? -ESTALE : 0;
1015 return -ECHILD;
1016 }
1017
1018 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1019 {
1020 struct nfs_inode *nfsi = NFS_I(inode);
1021 int ret;
1022
1023 if (mapping->nrpages != 0) {
1024 if (S_ISREG(inode->i_mode)) {
1025 ret = nfs_sync_mapping(mapping);
1026 if (ret < 0)
1027 return ret;
1028 }
1029 ret = invalidate_inode_pages2(mapping);
1030 if (ret < 0)
1031 return ret;
1032 }
1033 if (S_ISDIR(inode->i_mode)) {
1034 spin_lock(&inode->i_lock);
1035 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1036 spin_unlock(&inode->i_lock);
1037 }
1038 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1039 nfs_fscache_wait_on_invalidate(inode);
1040
1041 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1042 inode->i_sb->s_id,
1043 (unsigned long long)NFS_FILEID(inode));
1044 return 0;
1045 }
1046
1047 static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1048 {
1049 if (nfs_have_delegated_attributes(inode))
1050 return false;
1051 return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
1052 || nfs_attribute_timeout(inode)
1053 || NFS_STALE(inode);
1054 }
1055
1056 /**
1057 * nfs_revalidate_mapping - Revalidate the pagecache
1058 * @inode - pointer to host inode
1059 * @mapping - pointer to mapping
1060 */
1061 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1062 {
1063 struct nfs_inode *nfsi = NFS_I(inode);
1064 unsigned long *bitlock = &nfsi->flags;
1065 int ret = 0;
1066
1067 /* swapfiles are not supposed to be shared. */
1068 if (IS_SWAPFILE(inode))
1069 goto out;
1070
1071 if (nfs_mapping_need_revalidate_inode(inode)) {
1072 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1073 if (ret < 0)
1074 goto out;
1075 }
1076
1077 /*
1078 * We must clear NFS_INO_INVALID_DATA first to ensure that
1079 * invalidations that come in while we're shooting down the mappings
1080 * are respected. But, that leaves a race window where one revalidator
1081 * can clear the flag, and then another checks it before the mapping
1082 * gets invalidated. Fix that by serializing access to this part of
1083 * the function.
1084 *
1085 * At the same time, we need to allow other tasks to see whether we
1086 * might be in the middle of invalidating the pages, so we only set
1087 * the bit lock here if it looks like we're going to be doing that.
1088 */
1089 for (;;) {
1090 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1091 nfs_wait_bit_killable, TASK_KILLABLE);
1092 if (ret)
1093 goto out;
1094 spin_lock(&inode->i_lock);
1095 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1096 spin_unlock(&inode->i_lock);
1097 continue;
1098 }
1099 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1100 break;
1101 spin_unlock(&inode->i_lock);
1102 goto out;
1103 }
1104
1105 set_bit(NFS_INO_INVALIDATING, bitlock);
1106 smp_wmb();
1107 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1108 spin_unlock(&inode->i_lock);
1109 trace_nfs_invalidate_mapping_enter(inode);
1110 ret = nfs_invalidate_mapping(inode, mapping);
1111 trace_nfs_invalidate_mapping_exit(inode, ret);
1112
1113 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1114 smp_mb__after_atomic();
1115 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1116 out:
1117 return ret;
1118 }
1119
1120 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1121 {
1122 struct nfs_inode *nfsi = NFS_I(inode);
1123 unsigned long ret = 0;
1124
1125 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1126 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1127 && inode->i_version == fattr->pre_change_attr) {
1128 inode->i_version = fattr->change_attr;
1129 if (S_ISDIR(inode->i_mode))
1130 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1131 ret |= NFS_INO_INVALID_ATTR;
1132 }
1133 /* If we have atomic WCC data, we may update some attributes */
1134 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1135 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1136 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1137 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1138 ret |= NFS_INO_INVALID_ATTR;
1139 }
1140
1141 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1142 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1143 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1144 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1145 if (S_ISDIR(inode->i_mode))
1146 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1147 ret |= NFS_INO_INVALID_ATTR;
1148 }
1149 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1150 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1151 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1152 && nfsi->npages == 0) {
1153 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1154 ret |= NFS_INO_INVALID_ATTR;
1155 }
1156
1157 return ret;
1158 }
1159
1160 /**
1161 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1162 * @inode - pointer to inode
1163 * @fattr - updated attributes
1164 *
1165 * Verifies the attribute cache. If we have just changed the attributes,
1166 * so that fattr carries weak cache consistency data, then it may
1167 * also update the ctime/mtime/change_attribute.
1168 */
1169 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1170 {
1171 struct nfs_inode *nfsi = NFS_I(inode);
1172 loff_t cur_size, new_isize;
1173 unsigned long invalid = 0;
1174
1175
1176 if (nfs_have_delegated_attributes(inode))
1177 return 0;
1178 /* Has the inode gone and changed behind our back? */
1179 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1180 return -EIO;
1181 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1182 return -EIO;
1183
1184 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1185 inode->i_version != fattr->change_attr)
1186 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1187
1188 /* Verify a few of the more important attributes */
1189 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1190 invalid |= NFS_INO_INVALID_ATTR;
1191
1192 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1193 cur_size = i_size_read(inode);
1194 new_isize = nfs_size_to_loff_t(fattr->size);
1195 if (cur_size != new_isize && nfsi->npages == 0)
1196 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1197 }
1198
1199 /* Have any file permissions changed? */
1200 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1201 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1202 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1203 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1204 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1205 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1206
1207 /* Has the link count changed? */
1208 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1209 invalid |= NFS_INO_INVALID_ATTR;
1210
1211 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1212 invalid |= NFS_INO_INVALID_ATIME;
1213
1214 if (invalid != 0)
1215 nfs_set_cache_invalid(inode, invalid);
1216
1217 nfsi->read_cache_jiffies = fattr->time_start;
1218 return 0;
1219 }
1220
1221 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1222 {
1223 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
1224 return 0;
1225 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
1226 }
1227
1228 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1229 {
1230 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1231 return 0;
1232 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1233 }
1234
1235 static atomic_long_t nfs_attr_generation_counter;
1236
1237 static unsigned long nfs_read_attr_generation_counter(void)
1238 {
1239 return atomic_long_read(&nfs_attr_generation_counter);
1240 }
1241
1242 unsigned long nfs_inc_attr_generation_counter(void)
1243 {
1244 return atomic_long_inc_return(&nfs_attr_generation_counter);
1245 }
1246
1247 void nfs_fattr_init(struct nfs_fattr *fattr)
1248 {
1249 fattr->valid = 0;
1250 fattr->time_start = jiffies;
1251 fattr->gencount = nfs_inc_attr_generation_counter();
1252 fattr->owner_name = NULL;
1253 fattr->group_name = NULL;
1254 }
1255 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1256
1257 struct nfs_fattr *nfs_alloc_fattr(void)
1258 {
1259 struct nfs_fattr *fattr;
1260
1261 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1262 if (fattr != NULL)
1263 nfs_fattr_init(fattr);
1264 return fattr;
1265 }
1266 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1267
1268 struct nfs_fh *nfs_alloc_fhandle(void)
1269 {
1270 struct nfs_fh *fh;
1271
1272 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1273 if (fh != NULL)
1274 fh->size = 0;
1275 return fh;
1276 }
1277 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1278
1279 #ifdef NFS_DEBUG
1280 /*
1281 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1282 * in the same way that wireshark does
1283 *
1284 * @fh: file handle
1285 *
1286 * For debugging only.
1287 */
1288 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1289 {
1290 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1291 * not on the result */
1292 return nfs_fhandle_hash(fh);
1293 }
1294 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1295
1296 /*
1297 * _nfs_display_fhandle - display an NFS file handle on the console
1298 *
1299 * @fh: file handle to display
1300 * @caption: display caption
1301 *
1302 * For debugging only.
1303 */
1304 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1305 {
1306 unsigned short i;
1307
1308 if (fh == NULL || fh->size == 0) {
1309 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1310 return;
1311 }
1312
1313 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1314 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1315 for (i = 0; i < fh->size; i += 16) {
1316 __be32 *pos = (__be32 *)&fh->data[i];
1317
1318 switch ((fh->size - i - 1) >> 2) {
1319 case 0:
1320 printk(KERN_DEFAULT " %08x\n",
1321 be32_to_cpup(pos));
1322 break;
1323 case 1:
1324 printk(KERN_DEFAULT " %08x %08x\n",
1325 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1326 break;
1327 case 2:
1328 printk(KERN_DEFAULT " %08x %08x %08x\n",
1329 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1330 be32_to_cpup(pos + 2));
1331 break;
1332 default:
1333 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1334 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1335 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1336 }
1337 }
1338 }
1339 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1340 #endif
1341
1342 /**
1343 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1344 * @inode - pointer to inode
1345 * @fattr - attributes
1346 *
1347 * Attempt to divine whether or not an RPC call reply carrying stale
1348 * attributes got scheduled after another call carrying updated ones.
1349 *
1350 * To do so, the function first assumes that a more recent ctime means
1351 * that the attributes in fattr are newer, however it also attempt to
1352 * catch the case where ctime either didn't change, or went backwards
1353 * (if someone reset the clock on the server) by looking at whether
1354 * or not this RPC call was started after the inode was last updated.
1355 * Note also the check for wraparound of 'attr_gencount'
1356 *
1357 * The function returns 'true' if it thinks the attributes in 'fattr' are
1358 * more recent than the ones cached in the inode.
1359 *
1360 */
1361 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1362 {
1363 const struct nfs_inode *nfsi = NFS_I(inode);
1364
1365 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1366 nfs_ctime_need_update(inode, fattr) ||
1367 nfs_size_need_update(inode, fattr) ||
1368 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1369 }
1370
1371 /*
1372 * Don't trust the change_attribute, mtime, ctime or size if
1373 * a pnfs LAYOUTCOMMIT is outstanding
1374 */
1375 static void nfs_inode_attrs_handle_layoutcommit(struct inode *inode,
1376 struct nfs_fattr *fattr)
1377 {
1378 if (pnfs_layoutcommit_outstanding(inode))
1379 fattr->valid &= ~(NFS_ATTR_FATTR_CHANGE |
1380 NFS_ATTR_FATTR_MTIME |
1381 NFS_ATTR_FATTR_CTIME |
1382 NFS_ATTR_FATTR_SIZE);
1383 }
1384
1385 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1386 {
1387 int ret;
1388
1389 trace_nfs_refresh_inode_enter(inode);
1390
1391 nfs_inode_attrs_handle_layoutcommit(inode, fattr);
1392
1393 if (nfs_inode_attrs_need_update(inode, fattr))
1394 ret = nfs_update_inode(inode, fattr);
1395 else
1396 ret = nfs_check_inode_attributes(inode, fattr);
1397
1398 trace_nfs_refresh_inode_exit(inode, ret);
1399 return ret;
1400 }
1401
1402 /**
1403 * nfs_refresh_inode - try to update the inode attribute cache
1404 * @inode - pointer to inode
1405 * @fattr - updated attributes
1406 *
1407 * Check that an RPC call that returned attributes has not overlapped with
1408 * other recent updates of the inode metadata, then decide whether it is
1409 * safe to do a full update of the inode attributes, or whether just to
1410 * call nfs_check_inode_attributes.
1411 */
1412 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1413 {
1414 int status;
1415
1416 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1417 return 0;
1418 spin_lock(&inode->i_lock);
1419 status = nfs_refresh_inode_locked(inode, fattr);
1420 spin_unlock(&inode->i_lock);
1421
1422 return status;
1423 }
1424 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1425
1426 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1427 {
1428 unsigned long invalid = NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1429
1430 if (S_ISDIR(inode->i_mode))
1431 invalid |= NFS_INO_INVALID_DATA;
1432 nfs_set_cache_invalid(inode, invalid);
1433 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1434 return 0;
1435 return nfs_refresh_inode_locked(inode, fattr);
1436 }
1437
1438 /**
1439 * nfs_post_op_update_inode - try to update the inode attribute cache
1440 * @inode - pointer to inode
1441 * @fattr - updated attributes
1442 *
1443 * After an operation that has changed the inode metadata, mark the
1444 * attribute cache as being invalid, then try to update it.
1445 *
1446 * NB: if the server didn't return any post op attributes, this
1447 * function will force the retrieval of attributes before the next
1448 * NFS request. Thus it should be used only for operations that
1449 * are expected to change one or more attributes, to avoid
1450 * unnecessary NFS requests and trips through nfs_update_inode().
1451 */
1452 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1453 {
1454 int status;
1455
1456 spin_lock(&inode->i_lock);
1457 status = nfs_post_op_update_inode_locked(inode, fattr);
1458 spin_unlock(&inode->i_lock);
1459
1460 return status;
1461 }
1462 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1463
1464 /**
1465 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1466 * @inode - pointer to inode
1467 * @fattr - updated attributes
1468 *
1469 * After an operation that has changed the inode metadata, mark the
1470 * attribute cache as being invalid, then try to update it. Fake up
1471 * weak cache consistency data, if none exist.
1472 *
1473 * This function is mainly designed to be used by the ->write_done() functions.
1474 */
1475 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1476 {
1477 int status;
1478
1479 spin_lock(&inode->i_lock);
1480 /* Don't do a WCC update if these attributes are already stale */
1481 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1482 !nfs_inode_attrs_need_update(inode, fattr)) {
1483 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1484 | NFS_ATTR_FATTR_PRESIZE
1485 | NFS_ATTR_FATTR_PREMTIME
1486 | NFS_ATTR_FATTR_PRECTIME);
1487 goto out_noforce;
1488 }
1489 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1490 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1491 fattr->pre_change_attr = inode->i_version;
1492 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1493 }
1494 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1495 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1496 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1497 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1498 }
1499 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1500 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1501 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1502 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1503 }
1504 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1505 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1506 fattr->pre_size = i_size_read(inode);
1507 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1508 }
1509 out_noforce:
1510 status = nfs_post_op_update_inode_locked(inode, fattr);
1511 spin_unlock(&inode->i_lock);
1512 return status;
1513 }
1514 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1515
1516 /*
1517 * Many nfs protocol calls return the new file attributes after
1518 * an operation. Here we update the inode to reflect the state
1519 * of the server's inode.
1520 *
1521 * This is a bit tricky because we have to make sure all dirty pages
1522 * have been sent off to the server before calling invalidate_inode_pages.
1523 * To make sure no other process adds more write requests while we try
1524 * our best to flush them, we make them sleep during the attribute refresh.
1525 *
1526 * A very similar scenario holds for the dir cache.
1527 */
1528 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1529 {
1530 struct nfs_server *server;
1531 struct nfs_inode *nfsi = NFS_I(inode);
1532 loff_t cur_isize, new_isize;
1533 unsigned long invalid = 0;
1534 unsigned long now = jiffies;
1535 unsigned long save_cache_validity;
1536
1537 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1538 __func__, inode->i_sb->s_id, inode->i_ino,
1539 nfs_display_fhandle_hash(NFS_FH(inode)),
1540 atomic_read(&inode->i_count), fattr->valid);
1541
1542 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) {
1543 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1544 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1545 NFS_SERVER(inode)->nfs_client->cl_hostname,
1546 inode->i_sb->s_id, (long long)nfsi->fileid,
1547 (long long)fattr->fileid);
1548 goto out_err;
1549 }
1550
1551 /*
1552 * Make sure the inode's type hasn't changed.
1553 */
1554 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1555 /*
1556 * Big trouble! The inode has become a different object.
1557 */
1558 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1559 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1560 goto out_err;
1561 }
1562
1563 server = NFS_SERVER(inode);
1564 /* Update the fsid? */
1565 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1566 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1567 !IS_AUTOMOUNT(inode))
1568 server->fsid = fattr->fsid;
1569
1570 /*
1571 * Update the read time so we don't revalidate too often.
1572 */
1573 nfsi->read_cache_jiffies = fattr->time_start;
1574
1575 save_cache_validity = nfsi->cache_validity;
1576 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1577 | NFS_INO_INVALID_ATIME
1578 | NFS_INO_REVAL_FORCED
1579 | NFS_INO_REVAL_PAGECACHE);
1580
1581 /* Do atomic weak cache consistency updates */
1582 invalid |= nfs_wcc_update_inode(inode, fattr);
1583
1584 /* More cache consistency checks */
1585 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1586 if (inode->i_version != fattr->change_attr) {
1587 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1588 inode->i_sb->s_id, inode->i_ino);
1589 invalid |= NFS_INO_INVALID_ATTR
1590 | NFS_INO_INVALID_DATA
1591 | NFS_INO_INVALID_ACCESS
1592 | NFS_INO_INVALID_ACL
1593 | NFS_INO_REVAL_PAGECACHE;
1594 if (S_ISDIR(inode->i_mode))
1595 nfs_force_lookup_revalidate(inode);
1596 inode->i_version = fattr->change_attr;
1597 }
1598 } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1599 nfsi->cache_validity |= save_cache_validity;
1600
1601 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1602 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1603 } else if (server->caps & NFS_CAP_MTIME)
1604 nfsi->cache_validity |= save_cache_validity &
1605 (NFS_INO_INVALID_ATTR
1606 | NFS_INO_REVAL_FORCED);
1607
1608 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1609 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1610 } else if (server->caps & NFS_CAP_CTIME)
1611 nfsi->cache_validity |= save_cache_validity &
1612 (NFS_INO_INVALID_ATTR
1613 | NFS_INO_REVAL_FORCED);
1614
1615 /* Check if our cached file size is stale */
1616 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1617 new_isize = nfs_size_to_loff_t(fattr->size);
1618 cur_isize = i_size_read(inode);
1619 if (new_isize != cur_isize) {
1620 /* Do we perhaps have any outstanding writes, or has
1621 * the file grown beyond our last write? */
1622 if ((nfsi->npages == 0) || new_isize > cur_isize) {
1623 i_size_write(inode, new_isize);
1624 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1625 invalid &= ~NFS_INO_REVAL_PAGECACHE;
1626 }
1627 dprintk("NFS: isize change on server for file %s/%ld "
1628 "(%Ld to %Ld)\n",
1629 inode->i_sb->s_id,
1630 inode->i_ino,
1631 (long long)cur_isize,
1632 (long long)new_isize);
1633 }
1634 } else
1635 nfsi->cache_validity |= save_cache_validity &
1636 (NFS_INO_INVALID_ATTR
1637 | NFS_INO_REVAL_PAGECACHE
1638 | NFS_INO_REVAL_FORCED);
1639
1640
1641 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1642 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1643 else if (server->caps & NFS_CAP_ATIME)
1644 nfsi->cache_validity |= save_cache_validity &
1645 (NFS_INO_INVALID_ATIME
1646 | NFS_INO_REVAL_FORCED);
1647
1648 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1649 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1650 umode_t newmode = inode->i_mode & S_IFMT;
1651 newmode |= fattr->mode & S_IALLUGO;
1652 inode->i_mode = newmode;
1653 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1654 }
1655 } else if (server->caps & NFS_CAP_MODE)
1656 nfsi->cache_validity |= save_cache_validity &
1657 (NFS_INO_INVALID_ATTR
1658 | NFS_INO_INVALID_ACCESS
1659 | NFS_INO_INVALID_ACL
1660 | NFS_INO_REVAL_FORCED);
1661
1662 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1663 if (!uid_eq(inode->i_uid, fattr->uid)) {
1664 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1665 inode->i_uid = fattr->uid;
1666 }
1667 } else if (server->caps & NFS_CAP_OWNER)
1668 nfsi->cache_validity |= save_cache_validity &
1669 (NFS_INO_INVALID_ATTR
1670 | NFS_INO_INVALID_ACCESS
1671 | NFS_INO_INVALID_ACL
1672 | NFS_INO_REVAL_FORCED);
1673
1674 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1675 if (!gid_eq(inode->i_gid, fattr->gid)) {
1676 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1677 inode->i_gid = fattr->gid;
1678 }
1679 } else if (server->caps & NFS_CAP_OWNER_GROUP)
1680 nfsi->cache_validity |= save_cache_validity &
1681 (NFS_INO_INVALID_ATTR
1682 | NFS_INO_INVALID_ACCESS
1683 | NFS_INO_INVALID_ACL
1684 | NFS_INO_REVAL_FORCED);
1685
1686 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1687 if (inode->i_nlink != fattr->nlink) {
1688 invalid |= NFS_INO_INVALID_ATTR;
1689 if (S_ISDIR(inode->i_mode))
1690 invalid |= NFS_INO_INVALID_DATA;
1691 set_nlink(inode, fattr->nlink);
1692 }
1693 } else if (server->caps & NFS_CAP_NLINK)
1694 nfsi->cache_validity |= save_cache_validity &
1695 (NFS_INO_INVALID_ATTR
1696 | NFS_INO_REVAL_FORCED);
1697
1698 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1699 /*
1700 * report the blocks in 512byte units
1701 */
1702 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1703 }
1704 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1705 inode->i_blocks = fattr->du.nfs2.blocks;
1706
1707 /* Update attrtimeo value if we're out of the unstable period */
1708 if (invalid & NFS_INO_INVALID_ATTR) {
1709 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1710 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1711 nfsi->attrtimeo_timestamp = now;
1712 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1713 } else {
1714 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1715 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1716 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1717 nfsi->attrtimeo_timestamp = now;
1718 }
1719 }
1720 invalid &= ~NFS_INO_INVALID_ATTR;
1721 /* Don't invalidate the data if we were to blame */
1722 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1723 || S_ISLNK(inode->i_mode)))
1724 invalid &= ~NFS_INO_INVALID_DATA;
1725 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1726 (save_cache_validity & NFS_INO_REVAL_FORCED))
1727 nfs_set_cache_invalid(inode, invalid);
1728
1729 return 0;
1730 out_err:
1731 /*
1732 * No need to worry about unhashing the dentry, as the
1733 * lookup validation will know that the inode is bad.
1734 * (But we fall through to invalidate the caches.)
1735 */
1736 nfs_invalidate_inode(inode);
1737 return -ESTALE;
1738 }
1739
1740 struct inode *nfs_alloc_inode(struct super_block *sb)
1741 {
1742 struct nfs_inode *nfsi;
1743 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1744 if (!nfsi)
1745 return NULL;
1746 nfsi->flags = 0UL;
1747 nfsi->cache_validity = 0UL;
1748 #if IS_ENABLED(CONFIG_NFS_V4)
1749 nfsi->nfs4_acl = NULL;
1750 #endif /* CONFIG_NFS_V4 */
1751 return &nfsi->vfs_inode;
1752 }
1753 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1754
1755 static void nfs_i_callback(struct rcu_head *head)
1756 {
1757 struct inode *inode = container_of(head, struct inode, i_rcu);
1758 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1759 }
1760
1761 void nfs_destroy_inode(struct inode *inode)
1762 {
1763 call_rcu(&inode->i_rcu, nfs_i_callback);
1764 }
1765 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1766
1767 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1768 {
1769 #if IS_ENABLED(CONFIG_NFS_V4)
1770 INIT_LIST_HEAD(&nfsi->open_states);
1771 nfsi->delegation = NULL;
1772 nfsi->delegation_state = 0;
1773 init_rwsem(&nfsi->rwsem);
1774 nfsi->layout = NULL;
1775 #endif
1776 }
1777
1778 static void init_once(void *foo)
1779 {
1780 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1781
1782 inode_init_once(&nfsi->vfs_inode);
1783 INIT_LIST_HEAD(&nfsi->open_files);
1784 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1785 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1786 INIT_LIST_HEAD(&nfsi->commit_info.list);
1787 nfsi->npages = 0;
1788 nfsi->commit_info.ncommit = 0;
1789 atomic_set(&nfsi->commit_info.rpcs_out, 0);
1790 atomic_set(&nfsi->silly_count, 1);
1791 INIT_HLIST_HEAD(&nfsi->silly_list);
1792 init_waitqueue_head(&nfsi->waitqueue);
1793 nfs4_init_once(nfsi);
1794 }
1795
1796 static int __init nfs_init_inodecache(void)
1797 {
1798 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1799 sizeof(struct nfs_inode),
1800 0, (SLAB_RECLAIM_ACCOUNT|
1801 SLAB_MEM_SPREAD),
1802 init_once);
1803 if (nfs_inode_cachep == NULL)
1804 return -ENOMEM;
1805
1806 return 0;
1807 }
1808
1809 static void nfs_destroy_inodecache(void)
1810 {
1811 /*
1812 * Make sure all delayed rcu free inodes are flushed before we
1813 * destroy cache.
1814 */
1815 rcu_barrier();
1816 kmem_cache_destroy(nfs_inode_cachep);
1817 }
1818
1819 struct workqueue_struct *nfsiod_workqueue;
1820 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
1821
1822 /*
1823 * start up the nfsiod workqueue
1824 */
1825 static int nfsiod_start(void)
1826 {
1827 struct workqueue_struct *wq;
1828 dprintk("RPC: creating workqueue nfsiod\n");
1829 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1830 if (wq == NULL)
1831 return -ENOMEM;
1832 nfsiod_workqueue = wq;
1833 return 0;
1834 }
1835
1836 /*
1837 * Destroy the nfsiod workqueue
1838 */
1839 static void nfsiod_stop(void)
1840 {
1841 struct workqueue_struct *wq;
1842
1843 wq = nfsiod_workqueue;
1844 if (wq == NULL)
1845 return;
1846 nfsiod_workqueue = NULL;
1847 destroy_workqueue(wq);
1848 }
1849
1850 int nfs_net_id;
1851 EXPORT_SYMBOL_GPL(nfs_net_id);
1852
1853 static int nfs_net_init(struct net *net)
1854 {
1855 nfs_clients_init(net);
1856 return nfs_fs_proc_net_init(net);
1857 }
1858
1859 static void nfs_net_exit(struct net *net)
1860 {
1861 nfs_fs_proc_net_exit(net);
1862 nfs_cleanup_cb_ident_idr(net);
1863 }
1864
1865 static struct pernet_operations nfs_net_ops = {
1866 .init = nfs_net_init,
1867 .exit = nfs_net_exit,
1868 .id = &nfs_net_id,
1869 .size = sizeof(struct nfs_net),
1870 };
1871
1872 /*
1873 * Initialize NFS
1874 */
1875 static int __init init_nfs_fs(void)
1876 {
1877 int err;
1878
1879 err = register_pernet_subsys(&nfs_net_ops);
1880 if (err < 0)
1881 goto out9;
1882
1883 err = nfs_fscache_register();
1884 if (err < 0)
1885 goto out8;
1886
1887 err = nfsiod_start();
1888 if (err)
1889 goto out7;
1890
1891 err = nfs_fs_proc_init();
1892 if (err)
1893 goto out6;
1894
1895 err = nfs_init_nfspagecache();
1896 if (err)
1897 goto out5;
1898
1899 err = nfs_init_inodecache();
1900 if (err)
1901 goto out4;
1902
1903 err = nfs_init_readpagecache();
1904 if (err)
1905 goto out3;
1906
1907 err = nfs_init_writepagecache();
1908 if (err)
1909 goto out2;
1910
1911 err = nfs_init_directcache();
1912 if (err)
1913 goto out1;
1914
1915 #ifdef CONFIG_PROC_FS
1916 rpc_proc_register(&init_net, &nfs_rpcstat);
1917 #endif
1918 if ((err = register_nfs_fs()) != 0)
1919 goto out0;
1920
1921 return 0;
1922 out0:
1923 #ifdef CONFIG_PROC_FS
1924 rpc_proc_unregister(&init_net, "nfs");
1925 #endif
1926 nfs_destroy_directcache();
1927 out1:
1928 nfs_destroy_writepagecache();
1929 out2:
1930 nfs_destroy_readpagecache();
1931 out3:
1932 nfs_destroy_inodecache();
1933 out4:
1934 nfs_destroy_nfspagecache();
1935 out5:
1936 nfs_fs_proc_exit();
1937 out6:
1938 nfsiod_stop();
1939 out7:
1940 nfs_fscache_unregister();
1941 out8:
1942 unregister_pernet_subsys(&nfs_net_ops);
1943 out9:
1944 return err;
1945 }
1946
1947 static void __exit exit_nfs_fs(void)
1948 {
1949 nfs_destroy_directcache();
1950 nfs_destroy_writepagecache();
1951 nfs_destroy_readpagecache();
1952 nfs_destroy_inodecache();
1953 nfs_destroy_nfspagecache();
1954 nfs_fscache_unregister();
1955 unregister_pernet_subsys(&nfs_net_ops);
1956 #ifdef CONFIG_PROC_FS
1957 rpc_proc_unregister(&init_net, "nfs");
1958 #endif
1959 unregister_nfs_fs();
1960 nfs_fs_proc_exit();
1961 nfsiod_stop();
1962 }
1963
1964 /* Not quite true; I just maintain it */
1965 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1966 MODULE_LICENSE("GPL");
1967 module_param(enable_ino64, bool, 0644);
1968
1969 module_init(init_nfs_fs)
1970 module_exit(exit_nfs_fs)
Linux with added FPC-III support